Google Wave (currently in preview) is a new online collaboration tool created by Google. It provides the opportunity for asynchronous and synchronous communication among users. Waves allow participants to share resources, images, videos, documents, etc in order to discuss, collaborate, etc. It's a wonderful tool and my guess is that it will only become more powerful when it is open to all and a little more polished. Even in it's current state, it's quite robiust.
Diigo is the next generation of social bookmarking. In addition to simply bookmarking the page, you can include a snapshot (screenshot to include in the bookmark view),. You can also highlight information on the web page for inclusion in the bookmark (and also to be noted when someone visits the site from your diigo page. Another neat feature is that you can add sticky notes to the page. Again, these will be viewable by people visiting the page from your bookmark page. There are other features. I suggest visiting the page and taking the 'video tour' as you will love what diigo has to offer!
Pupils from Robin Hood primary school, Birmingham, worked with a film crew from the National College for School Leadership to express their desire to use their favourite technologies for learning in school.
Also posted on the NCSL Future website - http://future.ncsl.org.uk